摘要
为探究混流式水轮机改造前后的能量性能、空化性能及水力稳定性,基于流场数值模拟方法,对改造前后的水轮机进行全流道三维定常空化湍流计算及全流道三维非定常湍流计算。结果表明,改造后的水轮机临界空化系数降低13%,效率提高6.2%,且改造后水轮机转轮与活动导叶交界面处4个监测点脉动幅值最大降低17.8%,最小降低7.1%,该水轮机组的抗空化空蚀性能及可靠性均得到极大的提高,对混流式水轮机组的改造有一定的指导作用。
In order to gain the energy performance,cavitation performance and hydraulic stability on before and after the transformation of Francis turbine,numerical calculation of three-dimensional cavitation turbulent flow and unsteady turbulent flows are implemented in the whole flow passage of before and after the transformation of water turbine based on the numerical simulation method of the flow field.The results show that the critical cavitation coefficient of turbine after transformation reduces 13%,its efficiency increases 6.2%,and the maximum pulse amplitude decreased 17.8% and the minimum pulse amplitude decreased 7.1% on 4monitoring points in the interface of the runner and active guide vane.Therefore,the cavitation performance and reliability of the turbine has been greatly improved.The research results have a certain guiding role for the transformation of the Francis turbine.
出处
《水电能源科学》
北大核心
2016年第4期139-142,74,共5页
Water Resources and Power
基金
国家自然科学基金项目(51379179)
西华大学研究生创新基金资助项目(ycjj2015042)
关键词
混流式水轮机
改造
内部流动
对比
Francis turbine
reformation
internal flow
comparison
